Six-Month SEO Ranking Boost

My personal web-developer portfolio needs a steady, six-month push to climb higher on Google for “web development services” and “custom website design.” The engagement is capped at roughly $50 each month, so every task has to count toward visible ranking gains rather than vanity metrics... (Budget: $30 - $250 USD, Jobs: Content Strategy, Content Writing, Internet Marketing, Keyword Research, Link Building, Marketing, SEO, Website Optimization)